If you want to spend some time in Vienna before or after the wedding- here are some places to stay and things to do!
This is a nice hotel in the 8th district (Terence and Johanna's neighborhood), just under 30 minutes walk to the inner city of Vienna
https://www.rosewoodhotels.com/en/vienna
Rosewood Hotel Vienna is an upscale hotel directly in the center of Vienna's historic 1st district. It is minutes away from the famous Stephansdom and other landmarks.
https://www.radissonhotels.com/en-us/hotels/radisson-red-vienna
The Radisson Red is a great reasonably priced hotel directly on the scenic Danube Canal (great for running, walking and biking). Just a 20 minute walk to the city center. Plus a rooftop bar with a great view!
https://25hours-hotels.com/vienna/at-museumsquartier/
25Hours hotel is a hip design hotel also in the 8th District (Johanna and Terence's neighborhood). A 25 minute walk to the city center and very close to other Vienna landmarks like Parliament and the Volkgarten.